Question
You can use the formula $S _ { n } = \frac { n } { 2 } \left( a _ { 1 } + a _ { n } \right)$ to find the sum of the first $n$ terms of an arithmetic sequence, which is called the ________ of a ________ _______ _______.
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This formula is used to find the sum of the first $n$ terms of an arithmetic sequence. Show more…
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Fill in the blanks. You can use the formula $S_{n}=\frac{n}{2}\left(a_{1}+a_{n}\right)$ to find the sum of the first $n$ terms of an arithmetic sequence, which is called the ______ of a ______ ______ ______.
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The sum $S_{n}$ of the first $n$ terms of an arithmetic sequence $\left\{a_{n}\right\}$ whose first term is $a_{1}$ is found using the formula $S_{n}=\frac{n}{2}\left(a_{1}+a_{n}\right)$
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The formula $S_{n}=\frac{n}{2}\left(a_{1}+a_{n}\right)$ can be used to find the sum of the first $n$ terms of an arithmetic sequence, called the ____________.
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